Others have the majority of the answer covered, and there’s one additional angle that I think is important to highlight – C isn’t _inherently_ fast, it just has language features that make it well-suited for writing computationally efficient code and essentially enable you to trade development efficiency for execution efficiency. It’s not very hard to find/create examples of well-written code in other languages that is faster at a particular task than average or poorly-written C code, especially if the other language is one that was designed specifically for working on that kind of task.
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